Brother International MFC 8500 Service Manual - Page 156
PCB. Contacts, drum unit, main cover, and high-voltage power supply PCB. - printer cartridge
UPC - 012502603832
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Trouble (3) Light (4) Dark Action to be taken At the scanner Check the following components: - CIS unit - Main PCB At the printer side l Replace the toner cartridge with a new one and print 4 to 5 pages. If the problem persists, proceed to the next step. l Remove the toner cartridge and start printing. If printing takes place, clean the toner sensors (LED and light-receiver), check the sensor harnesses, and then replace the toner sensor PCBs. l Clean the high-voltage contacts for the transfer roller on the drum unit, main cover, and high-voltage power supply PCB. (Contacts U in the illustration given on page VI-28) l Clean the high-voltage contacts for the developer roller on the drum unit, main cover, and high-voltage power supply PCB. (Contacts S in the illustration given on page VI-28) l Clean the grounding contacts on the drum unit and main cover. (Contacts Q in the illustration given on page VI-28) l Check the connection of the main PCB and high-voltage power supply PCB. l Replace the drum unit. l Replace the high-voltage power supply PCB. l Replace the engine PCB. l Replace the main PCB. l Replace the laser unit. At the scanner Check the following components: - CIS unit - Main PCB At the printer side l Slide the wire cleaner to clean the corona wire inside the drum unit. l Clean the high-voltage contacts for the grid and charger on the drum unit, main cover, and high-voltage power supply PCB. (Contacts T and R in the illustration given on page VI- 28) l Replace the toner cartridge. l Replace the drum unit. l Replace the high-voltage power supply PCB. l Replace the main PCB. l Replace the engine PCB. VI - 22